text: /*
   * Copyright (C) 2012 The Android Open Source Project
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *      http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  // Provides a webviewchromium glue layer adapter from the internal Android
  // GL Functor data types into the types the chromium stack expects, and back.
  
  #define LOG_TAG "webviewchromium_plat_support"
  
  #include "draw_gl.h"
  
  #include <jni.h>
  #include <private/hwui/DrawGlInfo.h>
  #include <utils/Functor.h>
  #include <utils/Log.h>
  
  #include "functor_utils.h"
  
  #define NELEM(x) ((int) (sizeof(x) / sizeof((x)[0])))
  #define COMPILE_ASSERT(expr, err) \
  __unused static const char (err)[(expr) ? 1 : -1] = "";
  
  namespace android {
  namespace {
  
  AwDrawGLFunction* g_aw_drawgl_function = NULL;
  
  class DrawGLFunctor : public Functor {
   public:
    explicit DrawGLFunctor(jlong view_context) : view_context_(view_context) {}
    ~DrawGLFunctor() override {}
  
    // Functor
    status_t operator ()(int what, void* data) override {
      using uirenderer::DrawGlInfo;
      if (!g_aw_drawgl_function) {
        ALOGE("Cannot draw: no DrawGL Function installed");
        return DrawGlInfo::kStatusDone;
      }
  
      AwDrawGLInfo aw_info;
      aw_info.version = kAwDrawGLInfoVersion;
      switch (what) {
        case DrawGlInfo::kModeDraw: {
          aw_info.mode = AwDrawGLInfo::kModeDraw;
          DrawGlInfo* gl_info = reinterpret_cast<DrawGlInfo*>(data);
  
          // Map across the input values.
          aw_info.clip_left = gl_info->clipLeft;
          aw_info.clip_top = gl_info->clipTop;
          aw_info.clip_right = gl_info->clipRight;
          aw_info.clip_bottom = gl_info->clipBottom;
          aw_info.width = gl_info->width;
          aw_info.height = gl_info->height;
          aw_info.is_layer = gl_info->isLayer;
          COMPILE_ASSERT(NELEM(aw_info.transform) == NELEM(gl_info->transform),
                         mismatched_transform_matrix_sizes);
          for (int i = 0; i < NELEM(aw_info.transform); ++i) {
            aw_info.transform[i] = gl_info->transform[i];
          }
          break;
        }
        case DrawGlInfo::kModeProcess:
          aw_info.mode = AwDrawGLInfo::kModeProcess;
          break;
        case DrawGlInfo::kModeProcessNoContext:
          aw_info.mode = AwDrawGLInfo::kModeProcessNoContext;
          break;
        case DrawGlInfo::kModeSync:
          aw_info.mode = AwDrawGLInfo::kModeSync;
          break;
        default:
          ALOGE("Unexpected DrawGLInfo type %d", what);
          return DrawGlInfo::kStatusDone;
      }
  
      // Invoke the DrawGL method.
      g_aw_drawgl_function(view_context_, &aw_info, NULL);
  
      return DrawGlInfo::kStatusDone;
    }
  
   private:
    intptr_t view_context_;
  };
  
  jlong CreateGLFunctor(JNIEnv*, jclass, jlong view_context) {
    RaiseFileNumberLimit();
    return reinterpret_cast<jlong>(new DrawGLFunctor(view_context));
  }
  
  void DestroyGLFunctor(JNIEnv*, jclass, jlong functor) {
    delete reinterpret_cast<DrawGLFunctor*>(functor);
  }
  
  void SetChromiumAwDrawGLFunction(JNIEnv*, jclass, jlong draw_function) {
    g_aw_drawgl_function = reinterpret_cast<AwDrawGLFunction*>(draw_function);
  }
  
  const char kClassName[] = "com/android/webview/chromium/DrawGLFunctor";
  const JNINativeMethod kJniMethods[] = {
      { "nativeCreateGLFunctor", "(J)J",
          reinterpret_cast<void*>(CreateGLFunctor) },
      { "nativeDestroyGLFunctor", "(J)V",
          reinterpret_cast<void*>(DestroyGLFunctor) },
      { "nativeSetChromiumAwDrawGLFunction", "(J)V",
          reinterpret_cast<void*>(SetChromiumAwDrawGLFunction) },
  };
  
  }  // namespace
  
  void RegisterDrawGLFunctor(JNIEnv* env) {
    jclass clazz = env->FindClass(kClassName);
    LOG_ALWAYS_FATAL_IF(!clazz, "Unable to find class '%s'", kClassName);
  
    int res = env->RegisterNatives(clazz, kJniMethods, NELEM(kJniMethods));
    LOG_ALWAYS_FATAL_IF(res < 0, "register native methods failed: res=%d", res);
  }
  
  }  // namespace android
  